I'd say they are worth double that if fully working and clean / in tip-top condition.

The big issue with the ebay listings like the one you linked is that they use library images, not the actual item for sale, which will be in a much poorer state, and may well have odd issues not immediately obvious on bootup relating to the usual battery corrosion that is not mentioned (glitching graphics or slightly odd sound on some games, battery backup clock not working properly or corrupted gamesaves).

However on the plus side, the ebay listing claims:"For PS4 game disc, Street Fighter 5, The journey to the West, The Three Kingdoms."

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